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1 : : // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 : : /******************************************************************************
3 : : *
4 : : * Module Name: tbfadt - FADT table utilities
5 : : *
6 : : * Copyright (C) 2000 - 2020, Intel Corp.
7 : : *
8 : : *****************************************************************************/
9 : :
10 : : #include <acpi/acpi.h>
11 : : #include "accommon.h"
12 : : #include "actables.h"
13 : :
14 : : #define _COMPONENT ACPI_TABLES
15 : : ACPI_MODULE_NAME("tbfadt")
16 : :
17 : : /* Local prototypes */
18 : : static void
19 : : acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
20 : : u8 space_id,
21 : : u8 byte_width,
22 : : u64 address, const char *register_name, u8 flags);
23 : :
24 : : static void acpi_tb_convert_fadt(void);
25 : :
26 : : static void acpi_tb_setup_fadt_registers(void);
27 : :
28 : : static u64
29 : : acpi_tb_select_address(char *register_name, u32 address32, u64 address64);
30 : :
31 : : /* Table for conversion of FADT to common internal format and FADT validation */
32 : :
33 : : typedef struct acpi_fadt_info {
34 : : const char *name;
35 : : u16 address64;
36 : : u16 address32;
37 : : u16 length;
38 : : u8 default_length;
39 : : u8 flags;
40 : :
41 : : } acpi_fadt_info;
42 : :
43 : : #define ACPI_FADT_OPTIONAL 0
44 : : #define ACPI_FADT_REQUIRED 1
45 : : #define ACPI_FADT_SEPARATE_LENGTH 2
46 : : #define ACPI_FADT_GPE_REGISTER 4
47 : :
48 : : static struct acpi_fadt_info fadt_info_table[] = {
49 : : {"Pm1aEventBlock",
50 : : ACPI_FADT_OFFSET(xpm1a_event_block),
51 : : ACPI_FADT_OFFSET(pm1a_event_block),
52 : : ACPI_FADT_OFFSET(pm1_event_length),
53 : : ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
54 : : ACPI_FADT_REQUIRED},
55 : :
56 : : {"Pm1bEventBlock",
57 : : ACPI_FADT_OFFSET(xpm1b_event_block),
58 : : ACPI_FADT_OFFSET(pm1b_event_block),
59 : : ACPI_FADT_OFFSET(pm1_event_length),
60 : : ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
61 : : ACPI_FADT_OPTIONAL},
62 : :
63 : : {"Pm1aControlBlock",
64 : : ACPI_FADT_OFFSET(xpm1a_control_block),
65 : : ACPI_FADT_OFFSET(pm1a_control_block),
66 : : ACPI_FADT_OFFSET(pm1_control_length),
67 : : ACPI_PM1_REGISTER_WIDTH,
68 : : ACPI_FADT_REQUIRED},
69 : :
70 : : {"Pm1bControlBlock",
71 : : ACPI_FADT_OFFSET(xpm1b_control_block),
72 : : ACPI_FADT_OFFSET(pm1b_control_block),
73 : : ACPI_FADT_OFFSET(pm1_control_length),
74 : : ACPI_PM1_REGISTER_WIDTH,
75 : : ACPI_FADT_OPTIONAL},
76 : :
77 : : {"Pm2ControlBlock",
78 : : ACPI_FADT_OFFSET(xpm2_control_block),
79 : : ACPI_FADT_OFFSET(pm2_control_block),
80 : : ACPI_FADT_OFFSET(pm2_control_length),
81 : : ACPI_PM2_REGISTER_WIDTH,
82 : : ACPI_FADT_SEPARATE_LENGTH},
83 : :
84 : : {"PmTimerBlock",
85 : : ACPI_FADT_OFFSET(xpm_timer_block),
86 : : ACPI_FADT_OFFSET(pm_timer_block),
87 : : ACPI_FADT_OFFSET(pm_timer_length),
88 : : ACPI_PM_TIMER_WIDTH,
89 : : ACPI_FADT_SEPARATE_LENGTH}, /* ACPI 5.0A: Timer is optional */
90 : :
91 : : {"Gpe0Block",
92 : : ACPI_FADT_OFFSET(xgpe0_block),
93 : : ACPI_FADT_OFFSET(gpe0_block),
94 : : ACPI_FADT_OFFSET(gpe0_block_length),
95 : : 0,
96 : : ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER},
97 : :
98 : : {"Gpe1Block",
99 : : ACPI_FADT_OFFSET(xgpe1_block),
100 : : ACPI_FADT_OFFSET(gpe1_block),
101 : : ACPI_FADT_OFFSET(gpe1_block_length),
102 : : 0,
103 : : ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER}
104 : : };
105 : :
106 : : #define ACPI_FADT_INFO_ENTRIES \
107 : : (sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info))
108 : :
109 : : /* Table used to split Event Blocks into separate status/enable registers */
110 : :
111 : : typedef struct acpi_fadt_pm_info {
112 : : struct acpi_generic_address *target;
113 : : u16 source;
114 : : u8 register_num;
115 : :
116 : : } acpi_fadt_pm_info;
117 : :
118 : : static struct acpi_fadt_pm_info fadt_pm_info_table[] = {
119 : : {&acpi_gbl_xpm1a_status,
120 : : ACPI_FADT_OFFSET(xpm1a_event_block),
121 : : 0},
122 : :
123 : : {&acpi_gbl_xpm1a_enable,
124 : : ACPI_FADT_OFFSET(xpm1a_event_block),
125 : : 1},
126 : :
127 : : {&acpi_gbl_xpm1b_status,
128 : : ACPI_FADT_OFFSET(xpm1b_event_block),
129 : : 0},
130 : :
131 : : {&acpi_gbl_xpm1b_enable,
132 : : ACPI_FADT_OFFSET(xpm1b_event_block),
133 : : 1}
134 : : };
135 : :
136 : : #define ACPI_FADT_PM_INFO_ENTRIES \
137 : : (sizeof (fadt_pm_info_table) / sizeof (struct acpi_fadt_pm_info))
138 : :
139 : : /*******************************************************************************
140 : : *
141 : : * FUNCTION: acpi_tb_init_generic_address
142 : : *
143 : : * PARAMETERS: generic_address - GAS struct to be initialized
144 : : * space_id - ACPI Space ID for this register
145 : : * byte_width - Width of this register
146 : : * address - Address of the register
147 : : * register_name - ASCII name of the ACPI register
148 : : *
149 : : * RETURN: None
150 : : *
151 : : * DESCRIPTION: Initialize a Generic Address Structure (GAS)
152 : : * See the ACPI specification for a full description and
153 : : * definition of this structure.
154 : : *
155 : : ******************************************************************************/
156 : :
157 : : static void
158 : 18 : acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
159 : : u8 space_id,
160 : : u8 byte_width,
161 : : u64 address, const char *register_name, u8 flags)
162 : : {
163 : 18 : u8 bit_width;
164 : :
165 : : /*
166 : : * Bit width field in the GAS is only one byte long, 255 max.
167 : : * Check for bit_width overflow in GAS.
168 : : */
169 : 18 : bit_width = (u8)(byte_width * 8);
170 [ - + ]: 18 : if (byte_width > 31) { /* (31*8)=248, (32*8)=256 */
171 : : /*
172 : : * No error for GPE blocks, because we do not use the bit_width
173 : : * for GPEs, the legacy length (byte_width) is used instead to
174 : : * allow for a large number of GPEs.
175 : : */
176 [ # # ]: 0 : if (!(flags & ACPI_FADT_GPE_REGISTER)) {
177 : 0 : ACPI_ERROR((AE_INFO,
178 : : "%s - 32-bit FADT register is too long (%u bytes, %u bits) "
179 : : "to convert to GAS struct - 255 bits max, truncating",
180 : : register_name, byte_width,
181 : : (byte_width * 8)));
182 : : }
183 : :
184 : : bit_width = 255;
185 : : }
186 : :
187 : : /*
188 : : * The 64-bit Address field is non-aligned in the byte packed
189 : : * GAS struct.
190 : : */
191 : 18 : ACPI_MOVE_64_TO_64(&generic_address->address, &address);
192 : :
193 : : /* All other fields are byte-wide */
194 : :
195 : 18 : generic_address->space_id = space_id;
196 : 18 : generic_address->bit_width = bit_width;
197 : 18 : generic_address->bit_offset = 0;
198 : 18 : generic_address->access_width = 0; /* Access width ANY */
199 : 18 : }
200 : :
201 : : /*******************************************************************************
202 : : *
203 : : * FUNCTION: acpi_tb_select_address
204 : : *
205 : : * PARAMETERS: register_name - ASCII name of the ACPI register
206 : : * address32 - 32-bit address of the register
207 : : * address64 - 64-bit address of the register
208 : : *
209 : : * RETURN: The resolved 64-bit address
210 : : *
211 : : * DESCRIPTION: Select between 32-bit and 64-bit versions of addresses within
212 : : * the FADT. Used for the FACS and DSDT addresses.
213 : : *
214 : : * NOTES:
215 : : *
216 : : * Check for FACS and DSDT address mismatches. An address mismatch between
217 : : * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and
218 : : * DSDT/X_DSDT) could be a corrupted address field or it might indicate
219 : : * the presence of two FACS or two DSDT tables.
220 : : *
221 : : * November 2013:
222 : : * By default, as per the ACPICA specification, a valid 64-bit address is
223 : : * used regardless of the value of the 32-bit address. However, this
224 : : * behavior can be overridden via the acpi_gbl_use32_bit_fadt_addresses flag.
225 : : *
226 : : ******************************************************************************/
227 : :
228 : : static u64
229 : 3 : acpi_tb_select_address(char *register_name, u32 address32, u64 address64)
230 : : {
231 : :
232 [ + - ]: 3 : if (!address64) {
233 : :
234 : : /* 64-bit address is zero, use 32-bit address */
235 : :
236 : 3 : return ((u64)address32);
237 : : }
238 : :
239 [ # # # # ]: 0 : if (address32 && (address64 != (u64)address32)) {
240 : :
241 : : /* Address mismatch between 32-bit and 64-bit versions */
242 : :
243 [ # # ]: 0 : ACPI_BIOS_WARNING((AE_INFO,
244 : : "32/64X %s address mismatch in FADT: "
245 : : "0x%8.8X/0x%8.8X%8.8X, using %u-bit address",
246 : : register_name, address32,
247 : : ACPI_FORMAT_UINT64(address64),
248 : : acpi_gbl_use32_bit_fadt_addresses ? 32 :
249 : : 64));
250 : :
251 : : /* 32-bit address override */
252 : :
253 [ # # ]: 0 : if (acpi_gbl_use32_bit_fadt_addresses) {
254 : 0 : return ((u64)address32);
255 : : }
256 : : }
257 : :
258 : : /* Default is to use the 64-bit address */
259 : :
260 : : return (address64);
261 : : }
262 : :
263 : : /*******************************************************************************
264 : : *
265 : : * FUNCTION: acpi_tb_parse_fadt
266 : : *
267 : : * PARAMETERS: None
268 : : *
269 : : * RETURN: None
270 : : *
271 : : * DESCRIPTION: Initialize the FADT, DSDT and FACS tables
272 : : * (FADT contains the addresses of the DSDT and FACS)
273 : : *
274 : : ******************************************************************************/
275 : :
276 : 3 : void acpi_tb_parse_fadt(void)
277 : : {
278 : 3 : u32 length;
279 : 3 : struct acpi_table_header *table;
280 : 3 : struct acpi_table_desc *fadt_desc;
281 : 3 : acpi_status status;
282 : :
283 : : /*
284 : : * The FADT has multiple versions with different lengths,
285 : : * and it contains pointers to both the DSDT and FACS tables.
286 : : *
287 : : * Get a local copy of the FADT and convert it to a common format
288 : : * Map entire FADT, assumed to be smaller than one page.
289 : : */
290 : 3 : fadt_desc = &acpi_gbl_root_table_list.tables[acpi_gbl_fadt_index];
291 : 3 : status = acpi_tb_get_table(fadt_desc, &table);
292 [ - + ]: 3 : if (ACPI_FAILURE(status)) {
293 : 0 : return;
294 : : }
295 : 3 : length = fadt_desc->length;
296 : :
297 : : /*
298 : : * Validate the FADT checksum before we copy the table. Ignore
299 : : * checksum error as we want to try to get the DSDT and FACS.
300 : : */
301 : 3 : (void)acpi_tb_verify_checksum(table, length);
302 : :
303 : : /* Create a local copy of the FADT in common ACPI 2.0+ format */
304 : :
305 : 3 : acpi_tb_create_local_fadt(table, length);
306 : :
307 : : /* All done with the real FADT, unmap it */
308 : :
309 : 3 : acpi_tb_put_table(fadt_desc);
310 : :
311 : : /* Obtain the DSDT and FACS tables via their addresses within the FADT */
312 : :
313 : 3 : acpi_tb_install_standard_table((acpi_physical_address)acpi_gbl_FADT.
314 : : Xdsdt,
315 : : ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
316 : : FALSE, TRUE, &acpi_gbl_dsdt_index);
317 : :
318 : : /* If Hardware Reduced flag is set, there is no FACS */
319 : :
320 [ + - ]: 3 : if (!acpi_gbl_reduced_hardware) {
321 [ + - ]: 3 : if (acpi_gbl_FADT.facs) {
322 : 3 : acpi_tb_install_standard_table((acpi_physical_address)
323 : : acpi_gbl_FADT.facs,
324 : : ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
325 : : FALSE, TRUE,
326 : : &acpi_gbl_facs_index);
327 : : }
328 [ - + ]: 3 : if (acpi_gbl_FADT.Xfacs) {
329 : 0 : acpi_tb_install_standard_table((acpi_physical_address)
330 : : acpi_gbl_FADT.Xfacs,
331 : : ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
332 : : FALSE, TRUE,
333 : : &acpi_gbl_xfacs_index);
334 : : }
335 : : }
336 : : }
337 : :
338 : : /*******************************************************************************
339 : : *
340 : : * FUNCTION: acpi_tb_create_local_fadt
341 : : *
342 : : * PARAMETERS: table - Pointer to BIOS FADT
343 : : * length - Length of the table
344 : : *
345 : : * RETURN: None
346 : : *
347 : : * DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
348 : : * Performs validation on some important FADT fields.
349 : : *
350 : : * NOTE: We create a local copy of the FADT regardless of the version.
351 : : *
352 : : ******************************************************************************/
353 : :
354 : 3 : void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
355 : : {
356 : : /*
357 : : * Check if the FADT is larger than the largest table that we expect
358 : : * (typically the current ACPI specification version). If so, truncate
359 : : * the table, and issue a warning.
360 : : */
361 [ - + ]: 3 : if (length > sizeof(struct acpi_table_fadt)) {
362 : 0 : ACPI_BIOS_WARNING((AE_INFO,
363 : : "FADT (revision %u) is longer than %s length, "
364 : : "truncating length %u to %u",
365 : : table->revision, ACPI_FADT_CONFORMANCE,
366 : : length,
367 : : (u32)sizeof(struct acpi_table_fadt)));
368 : : }
369 : :
370 : : /* Clear the entire local FADT */
371 : :
372 : 3 : memset(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt));
373 : :
374 : : /* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */
375 : :
376 : 3 : memcpy(&acpi_gbl_FADT, table,
377 : 3 : ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
378 : :
379 : : /* Take a copy of the Hardware Reduced flag */
380 : :
381 : 3 : acpi_gbl_reduced_hardware = FALSE;
382 [ - + ]: 3 : if (acpi_gbl_FADT.flags & ACPI_FADT_HW_REDUCED) {
383 : 0 : acpi_gbl_reduced_hardware = TRUE;
384 : : }
385 : :
386 : : /* Convert the local copy of the FADT to the common internal format */
387 : :
388 : 3 : acpi_tb_convert_fadt();
389 : :
390 : : /* Initialize the global ACPI register structures */
391 : :
392 : 3 : acpi_tb_setup_fadt_registers();
393 : 3 : }
394 : :
395 : : /*******************************************************************************
396 : : *
397 : : * FUNCTION: acpi_tb_convert_fadt
398 : : *
399 : : * PARAMETERS: none - acpi_gbl_FADT is used.
400 : : *
401 : : * RETURN: None
402 : : *
403 : : * DESCRIPTION: Converts all versions of the FADT to a common internal format.
404 : : * Expand 32-bit addresses to 64-bit as necessary. Also validate
405 : : * important fields within the FADT.
406 : : *
407 : : * NOTE: acpi_gbl_FADT must be of size (struct acpi_table_fadt), and must
408 : : * contain a copy of the actual BIOS-provided FADT.
409 : : *
410 : : * Notes on 64-bit register addresses:
411 : : *
412 : : * After this FADT conversion, later ACPICA code will only use the 64-bit "X"
413 : : * fields of the FADT for all ACPI register addresses.
414 : : *
415 : : * The 64-bit X fields are optional extensions to the original 32-bit FADT
416 : : * V1.0 fields. Even if they are present in the FADT, they are optional and
417 : : * are unused if the BIOS sets them to zero. Therefore, we must copy/expand
418 : : * 32-bit V1.0 fields to the 64-bit X fields if the 64-bit X field is originally
419 : : * zero.
420 : : *
421 : : * For ACPI 1.0 FADTs (that contain no 64-bit addresses), all 32-bit address
422 : : * fields are expanded to the corresponding 64-bit X fields in the internal
423 : : * common FADT.
424 : : *
425 : : * For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded
426 : : * to the corresponding 64-bit X fields, if the 64-bit field is originally
427 : : * zero. Adhering to the ACPI specification, we completely ignore the 32-bit
428 : : * field if the 64-bit field is valid, regardless of whether the host OS is
429 : : * 32-bit or 64-bit.
430 : : *
431 : : * Possible additional checks:
432 : : * (acpi_gbl_FADT.pm1_event_length >= 4)
433 : : * (acpi_gbl_FADT.pm1_control_length >= 2)
434 : : * (acpi_gbl_FADT.pm_timer_length >= 4)
435 : : * Gpe block lengths must be multiple of 2
436 : : *
437 : : ******************************************************************************/
438 : :
439 : 3 : static void acpi_tb_convert_fadt(void)
440 : : {
441 : 3 : const char *name;
442 : 3 : struct acpi_generic_address *address64;
443 : 3 : u32 address32;
444 : 3 : u8 length;
445 : 3 : u8 flags;
446 : 3 : u32 i;
447 : :
448 : : /*
449 : : * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
450 : : * should be zero are indeed zero. This will workaround BIOSs that
451 : : * inadvertently place values in these fields.
452 : : *
453 : : * The ACPI 1.0 reserved fields that will be zeroed are the bytes located
454 : : * at offset 45, 55, 95, and the word located at offset 109, 110.
455 : : *
456 : : * Note: The FADT revision value is unreliable. Only the length can be
457 : : * trusted.
458 : : */
459 [ + - ]: 3 : if (acpi_gbl_FADT.header.length <= ACPI_FADT_V2_SIZE) {
460 : 3 : acpi_gbl_FADT.preferred_profile = 0;
461 : 3 : acpi_gbl_FADT.pstate_control = 0;
462 : 3 : acpi_gbl_FADT.cst_control = 0;
463 : 3 : acpi_gbl_FADT.boot_flags = 0;
464 : : }
465 : :
466 : : /*
467 : : * Now we can update the local FADT length to the length of the
468 : : * current FADT version as defined by the ACPI specification.
469 : : * Thus, we will have a common FADT internally.
470 : : */
471 : 3 : acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
472 : :
473 : : /*
474 : : * Expand the 32-bit DSDT addresses to 64-bit as necessary.
475 : : * Later ACPICA code will always use the X 64-bit field.
476 : : */
477 : 3 : acpi_gbl_FADT.Xdsdt = acpi_tb_select_address("DSDT",
478 : : acpi_gbl_FADT.dsdt,
479 : : acpi_gbl_FADT.Xdsdt);
480 : :
481 : : /* If Hardware Reduced flag is set, we are all done */
482 : :
483 [ + - ]: 3 : if (acpi_gbl_reduced_hardware) {
484 : : return;
485 : : }
486 : :
487 : : /* Examine all of the 64-bit extended address fields (X fields) */
488 : :
489 [ + + ]: 27 : for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
490 : : /*
491 : : * Get the 32-bit and 64-bit addresses, as well as the register
492 : : * length and register name.
493 : : */
494 : 24 : address32 = *ACPI_ADD_PTR(u32,
495 : : &acpi_gbl_FADT,
496 : : fadt_info_table[i].address32);
497 : :
498 : 24 : address64 = ACPI_ADD_PTR(struct acpi_generic_address,
499 : : &acpi_gbl_FADT,
500 : : fadt_info_table[i].address64);
501 : :
502 : 24 : length = *ACPI_ADD_PTR(u8,
503 : : &acpi_gbl_FADT,
504 : : fadt_info_table[i].length);
505 : :
506 : 24 : name = fadt_info_table[i].name;
507 : 24 : flags = fadt_info_table[i].flags;
508 : :
509 : : /*
510 : : * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
511 : : * generic address structures as necessary. Later code will always use
512 : : * the 64-bit address structures.
513 : : *
514 : : * November 2013:
515 : : * Now always use the 64-bit address if it is valid (non-zero), in
516 : : * accordance with the ACPI specification which states that a 64-bit
517 : : * address supersedes the 32-bit version. This behavior can be
518 : : * overridden by the acpi_gbl_use32_bit_fadt_addresses flag.
519 : : *
520 : : * During 64-bit address construction and verification,
521 : : * these cases are handled:
522 : : *
523 : : * Address32 zero, Address64 [don't care] - Use Address64
524 : : *
525 : : * No override: if acpi_gbl_use32_bit_fadt_addresses is FALSE, and:
526 : : * Address32 non-zero, Address64 zero - Copy/use Address32
527 : : * Address32 non-zero == Address64 non-zero - Use Address64
528 : : * Address32 non-zero != Address64 non-zero - Warning, use Address64
529 : : *
530 : : * Override: if acpi_gbl_use32_bit_fadt_addresses is TRUE, and:
531 : : * Address32 non-zero, Address64 zero - Copy/use Address32
532 : : * Address32 non-zero == Address64 non-zero - Copy/use Address32
533 : : * Address32 non-zero != Address64 non-zero - Warning, copy/use Address32
534 : : *
535 : : * Note: space_id is always I/O for 32-bit legacy address fields
536 : : */
537 [ + + ]: 24 : if (address32) {
538 [ - + ]: 12 : if (address64->address) {
539 [ # # ]: 0 : if (address64->address != (u64)address32) {
540 : :
541 : : /* Address mismatch */
542 : :
543 [ # # ]: 0 : ACPI_BIOS_WARNING((AE_INFO,
544 : : "32/64X address mismatch in FADT/%s: "
545 : : "0x%8.8X/0x%8.8X%8.8X, using %u-bit address",
546 : : name, address32,
547 : : ACPI_FORMAT_UINT64
548 : : (address64->address),
549 : : acpi_gbl_use32_bit_fadt_addresses
550 : : ? 32 : 64));
551 : : }
552 : :
553 : : /*
554 : : * For each extended field, check for length mismatch
555 : : * between the legacy length field and the corresponding
556 : : * 64-bit X length field.
557 : : * Note: If the legacy length field is > 0xFF bits, ignore
558 : : * this check. (GPE registers can be larger than the
559 : : * 64-bit GAS structure can accommodate, 0xFF bits).
560 : : */
561 [ # # ]: 0 : if ((ACPI_MUL_8(length) <= ACPI_UINT8_MAX) &&
562 [ # # ]: 0 : (address64->bit_width !=
563 : : ACPI_MUL_8(length))) {
564 : 0 : ACPI_BIOS_WARNING((AE_INFO,
565 : : "32/64X length mismatch in FADT/%s: %u/%u",
566 : : name,
567 : : ACPI_MUL_8(length),
568 : : address64->
569 : : bit_width));
570 : : }
571 : : }
572 : :
573 : : /*
574 : : * Hardware register access code always uses the 64-bit fields.
575 : : * So if the 64-bit field is zero or is to be overridden,
576 : : * initialize it with the 32-bit fields.
577 : : * Note that when the 32-bit address favor is specified, the
578 : : * 64-bit fields are always re-initialized so that
579 : : * access_size/bit_width/bit_offset fields can be correctly
580 : : * configured to the values to trigger a 32-bit compatible
581 : : * access mode in the hardware register access code.
582 : : */
583 [ - + ]: 12 : if (!address64->address
584 [ # # ]: 0 : || acpi_gbl_use32_bit_fadt_addresses) {
585 : 12 : acpi_tb_init_generic_address(address64,
586 : : ACPI_ADR_SPACE_SYSTEM_IO,
587 : : length,
588 : : (u64)address32,
589 : : name, flags);
590 : : }
591 : : }
592 : :
593 [ + + ]: 24 : if (fadt_info_table[i].flags & ACPI_FADT_REQUIRED) {
594 : : /*
595 : : * Field is required (Pm1a_event, Pm1a_control).
596 : : * Both the address and length must be non-zero.
597 : : */
598 [ + - - + ]: 6 : if (!address64->address || !length) {
599 : 0 : ACPI_BIOS_ERROR((AE_INFO,
600 : : "Required FADT field %s has zero address and/or length: "
601 : : "0x%8.8X%8.8X/0x%X",
602 : : name,
603 : : ACPI_FORMAT_UINT64(address64->
604 : : address),
605 : : length));
606 : : }
607 [ + + ]: 18 : } else if (fadt_info_table[i].flags & ACPI_FADT_SEPARATE_LENGTH) {
608 : : /*
609 : : * Field is optional (Pm2_control, GPE0, GPE1) AND has its own
610 : : * length field. If present, both the address and length must
611 : : * be valid.
612 : : */
613 [ + + + - : 12 : if ((address64->address && !length) ||
+ + ]
614 [ - + ]: 6 : (!address64->address && length)) {
615 [ # # # # ]: 0 : ACPI_BIOS_WARNING((AE_INFO,
616 : : "Optional FADT field %s has valid %s but zero %s: "
617 : : "0x%8.8X%8.8X/0x%X", name,
618 : : (length ? "Length" :
619 : : "Address"),
620 : : (length ? "Address" :
621 : : "Length"),
622 : : ACPI_FORMAT_UINT64
623 : : (address64->address),
624 : : length));
625 : : }
626 : : }
627 : : }
628 : : }
629 : :
630 : : /*******************************************************************************
631 : : *
632 : : * FUNCTION: acpi_tb_setup_fadt_registers
633 : : *
634 : : * PARAMETERS: None, uses acpi_gbl_FADT.
635 : : *
636 : : * RETURN: None
637 : : *
638 : : * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally,
639 : : * force FADT register definitions to their default lengths.
640 : : *
641 : : ******************************************************************************/
642 : :
643 : 3 : static void acpi_tb_setup_fadt_registers(void)
644 : : {
645 : 3 : struct acpi_generic_address *target64;
646 : 3 : struct acpi_generic_address *source64;
647 : 3 : u8 pm1_register_byte_width;
648 : 3 : u32 i;
649 : :
650 : : /*
651 : : * Optionally check all register lengths against the default values and
652 : : * update them if they are incorrect.
653 : : */
654 [ + - ]: 3 : if (acpi_gbl_use_default_register_widths) {
655 [ + + ]: 27 : for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
656 : 24 : target64 =
657 : 24 : ACPI_ADD_PTR(struct acpi_generic_address,
658 : : &acpi_gbl_FADT,
659 : : fadt_info_table[i].address64);
660 : :
661 : : /*
662 : : * If a valid register (Address != 0) and the (default_length > 0)
663 : : * (Not a GPE register), then check the width against the default.
664 : : */
665 [ + + ]: 24 : if ((target64->address) &&
666 [ + + ]: 12 : (fadt_info_table[i].default_length > 0) &&
667 : : (fadt_info_table[i].default_length !=
668 [ - + ]: 9 : target64->bit_width)) {
669 : 0 : ACPI_BIOS_WARNING((AE_INFO,
670 : : "Invalid length for FADT/%s: %u, using default %u",
671 : : fadt_info_table[i].name,
672 : : target64->bit_width,
673 : : fadt_info_table[i].
674 : : default_length));
675 : :
676 : : /* Incorrect size, set width to the default */
677 : :
678 : 0 : target64->bit_width =
679 : 0 : fadt_info_table[i].default_length;
680 : : }
681 : : }
682 : : }
683 : :
684 : : /*
685 : : * Get the length of the individual PM1 registers (enable and status).
686 : : * Each register is defined to be (event block length / 2). Extra divide
687 : : * by 8 converts bits to bytes.
688 : : */
689 : 3 : pm1_register_byte_width = (u8)
690 : 3 : ACPI_DIV_16(acpi_gbl_FADT.xpm1a_event_block.bit_width);
691 : :
692 : : /*
693 : : * Calculate separate GAS structs for the PM1x (A/B) Status and Enable
694 : : * registers. These addresses do not appear (directly) in the FADT, so it
695 : : * is useful to pre-calculate them from the PM1 Event Block definitions.
696 : : *
697 : : * The PM event blocks are split into two register blocks, first is the
698 : : * PM Status Register block, followed immediately by the PM Enable
699 : : * Register block. Each is of length (pm1_event_length/2)
700 : : *
701 : : * Note: The PM1A event block is required by the ACPI specification.
702 : : * However, the PM1B event block is optional and is rarely, if ever,
703 : : * used.
704 : : */
705 : :
706 [ + + ]: 15 : for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++) {
707 : 12 : source64 =
708 : 12 : ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
709 : : fadt_pm_info_table[i].source);
710 : :
711 [ + + ]: 12 : if (source64->address) {
712 : 6 : acpi_tb_init_generic_address(fadt_pm_info_table[i].
713 : 6 : target, source64->space_id,
714 : : pm1_register_byte_width,
715 : : source64->address +
716 : 6 : (fadt_pm_info_table[i].
717 : 6 : register_num *
718 : : pm1_register_byte_width),
719 : : "PmRegisters", 0);
720 : : }
721 : : }
722 : 3 : }
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